3(r-4)=57

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Solution for 3(r-4)=57 equation: 



3(r-4)=57

We move all terms to the left:

3(r-4)-(57)=0

We multiply parentheses

3r-12-57=0

We add all the numbers together, and all the variables

3r-69=0

We move all terms containing r to the left, all other terms to the right

3r=69

r=69/3

r=23

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